The equations $x = a \cos \theta$ and $y = b \sin \theta$ with $a > b$ represent a conic section. Its eccentricity $e$ is given by:
- A$e^2 = \frac{a^2 + b^2}{a^2}$
- B$e^2 = \frac{a^2 + b^2}{b^2}$
- C$e^2 = \frac{a^2 - b^2}{a^2}$
- D$e^2 = \frac{a^2 - b^2}{b^2}$
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